Adjustable liquid fuel burner nozzle



Feb. 28, 1956 N. F. MARTIN 2,736,603

ADJUSTABLE LIQUID FUEL. BURNER NOZZLE Filed Jan. 9, 1953 FIG. 4.

IN V EN TOR.

United States Patent ADJUSTABLE LIQUID FUEL BURNER NOZZLE Nicholas F. Martin, Wilmington, Del.

Application January 9, 1953, Serial No. 330,495

3 Claims. (Cl. 299-136) This invention relates to adjustable liquid fuel burner nozzles and more particularly to an improved nozzle of the form disclosed in my Patent No. 2,583,659, patented January 29, 1952.

It is among the objects of the present invention to provide an improved liquid fuel burner nozzle which can be manually adjusted to vary the fuel flow capacity of the nozzle; which'includes' means for accurately preadjusting the nozzle to a definite fuel flow capacity and means for accurately re-setting the nozzle to change the fuel flow capacity thereof by predetermined increments from the preset capacity; which has positive limit stop means determining the range of adjustment of the nozzle; which has an annular fuel discharge orifice providing a substantially complete atomization of the fuel discharged therefrom and means for accurately centering said orifice relative to the adjacent portion of the nozzle; and which is simple and durable inconstruction, economical to manufacture, easy to adjust, and accurate and efficient in operation.

Other objects and advantages will become apparent from a consideration of the following description and the appended claims in conjunction with the accompanying drawing wherein:

Figure l is a front end elevational view of an adjustable nozzle for a fuel oil burner, illustrative of the invention;

Figure 2 is a longitudinal cross sectional view on the line 22 of Figure 1;

Figure 3 is a transverse cross sectional view on the line 3-3 of Figure 2; and

Figure 4 is a fragmentary side elevational view of the end portion of the nozzle carrying the adjusting means.

With continued reference to the drawing, the nozzle comprises an elongated tubular barrel having annu-' lar recesses at its opposite ends providing externally screw threaded end portions 11 and 12 of reduced external diameter. An end plug 13 is disposed at one end of the barrel 10 and is provided with an internally screw threaded recess receiving the reduced end portion 11 of the barrel which end portion firmly secures the end plug 13 onto the corresponding end of the barrel. The end plug 13' is provided with a bore 14 extending coaxially therethrough and with a counterbore 15 in the outer end thereof coaxial with the bore 14. The plug 13 is annularly recessed at its outer end to provide an externally screw threaded end portion 16 .of reduced diameter and an annular nut 17 having an inwardly directed annular flange 18 is threaded onto the reduced end portion 16 of the plug with the flange 18 spaced from the adjacent outer end of the plug 13.

A valve orifice disc 20 is seated in the counterbore 15 at the outer end of the plug 13 and is provided with a central, outwardly tapered orifice 21 registering with the bore 14 through the plug 13. This orifice plate is provided with an outer cylindrical portion 22 ofreduced diameter received within the inner edge of the nut flange 18.

An annular groove 23 is provided in the outer end of the plug 13 within the counterbore 15 and oil feed holes 24 extend through the plug 13 from the inner end of the plug to the groove 23. Radially disposed grooves 25 in the outer end of the plug 13 within the counterbore 15 lead from the annular groove 23 to the adjacent end portion of the bore 14, the holes 24, annular groove 23 and radial grooves 25 providing passageways for fuel oil from the interior of the tubular barrel 10 to the inner end of the orifice 21 in the orifice disc or plate 20 of th nozzle.

An end plug 27 is disposed at the opposite end of the barrel 10 and has in one end an internally screw threaded recess receiving the end portion 12 of the barrel which end portion rigidly secures the plug 27 on the corresponding end of the barrel. Between the end-plugs 13 and 27 a fuel inlet fitting 28 projects laterally from the barrel and has a bore 29 communicating with the interior of the tubular barrel 10 for supplying fuel oil under pressure to the interior of the barrel.

The end plug 27 has a bore 30, of larger diameter than the bore 14 in the plug 13, extending coaxially therethrough, and the bore 30 is restricted near the inner end of the plug to provide within the bore anannular shoulder 31 adjacent the recess in the inner end of the plug. Near the outer end of the plug the bore 30 is provided with a screw thread formation 32 and the outer end of the plug is annularly recessed to provide an annular shoulder 33 disposed substantially in a plane perpendicular to the longitudinal center line of the plug and a cylindrical boss 34 surrounding the screw threaded portion 32 of the bore 30 and is surrounded by the annular shoulder 33.

An antifriction ball bearing 35 is disposed in the bore 30 and has its outer race 36 bearing on the internal annular shoulder 31 of the end plug 27. A sleeve 37 having an external screw thread formation thereon is threaded into the bore 30 and bears at its inner end against the ball bearing outer race 36 in opposition to the annular shoulder 31 to securely clamp the ball hearing in position relative to the plug 27 and a rotatable element, generally indicated at 38, is disposed at the outer end of the plug 27. The rotatable element 38 comprises a cylindrical shank 40 rotatably received in the cylindrical sleeve 37 and having a reduced end portion extending through the inner race 41 of the ball bearing 35 and providing an annular shoulder bearing against one side of this ball bearing inner race. The outer part of the reduced end portion of the shank 40 is externally screw threaded and a nut 42 is threaded onto this screw threaded end portion of the shank and clamps the ball bearing inner race 41 between itself and the opposed annular shoulder on the shank 40, the ball bearing 35 thus holding the shank 40 against longitudinal movement relative to the sleeve 37 and the end plug 27 while providing free rotational movement of the shank relative to the'sleeve and the end plug. A cylindrical head 44 is secured to the outer end of the shank 40, this head hav' ing a central aperture and a counterbore in one side thereof coaxial with the aperture and receiving the adjacent end portion of the shank 40. The head is secured to the shank by a stud bolt 45 extending through the aperture in the head and threaded into aninternally screw threaded, axially disposed bore 46' of the shank and the head extends marginally beyond the boss 34 on the outer end of the plug 27 and has an annular flange portion 46 provided with a surface substantially in a plane perpendicular to the longitudinal center line of the shank 40 and disposed in opposed and spaced relationship tothe annular shoulder 33- on the outer end of the plugZT.

A needle valve shank 50 extends coaxially through the barrel 1t) and has a pointed end 51 disposed in the outwardly. tapered orifice 21; in the orificedisc 22.. At: its.

other end, this shank is provided with externally screwthreadediextension 52; of reduced diameter threadedly received in a screw threaded, reduced portion 53: of the bore 46 in. the shank: all. with. an; external. screw thread formation. 54: at the, inner or proximal end of the extension 52 and a nut 55 is threaded onto the screw thread formation 54. An an:- nular sealing element 5.6-.Ofi resilient sheet material, such as. brass GE- bronze, is. secured. at one. end tovthe' nut 56 in. surrounding. relationship. to. theper-iphera'l rim of the nutv and is secured at its: other, larger. end: to. theend or". the barrel 10 adjacent the plug 27 to provide a seal be: tween the; interior of; the bench and the bore 39 in the plug-2:7. Thissealing element 56 holds. the needlevalve sternSl); against rotational movement relative to' the barrel 10,.but; provides freedom of longitudinal movement of the stem; relative to the barrel sothatithe stem can be ad.- jus-tably moved, longitudinally thereofto vary the. effective area ofithe'uozzle orifice between the pointedendxof'thc stem and the orifice opening Zlinthe disc 22 by rotating the rotatable member ilfilrelativc to the plug 27' and barrel 10 of the device;

A flat, annular collar 60 surrounds the boss 34- on the. outer end of the plug 27 and is disposed between the annular shoulder 33 on the plug and the flange 46 ofthe head 44- of the rotatable member. A set screw 61 is threaded through a tapped hole in the collar 69 and engages the boss 34. to releasably secure the. collar 68- at selected positions of adjustment rotationally of the boss. A stop pin 62. is threaded into a tapped hole in the collar 60 andprojects from the side of the collar adjacent the head 44. into an annular recess 63 provided within the head flange 4-6 surrounding theouter end of'the sleeve 37:, and a stop pin 64 is threaded through a tapped hole- 55 in the head 44 and projects into the recess 63; The stop pin 62 is disposed in the path of the stop pin 64 when the element 38 is rotatedrelative to the plug 27 and these two complementary stop pins; cooperate to limit rota tional movement of the element 38 relative to the plug27 to an extent not exceeding one complete rotation.

The. surface; of the head flange 46 adjacent thecollar 60. is, provided with a. circular series of shallow recesses spaced. apart at uniform angular intervals around the. annular surfaceot the cylindricallflange 46. The collar (it)v is drilled. transversely thereof, to; provide a threaded holetherethrough in which holeisv placed a sphericalball;

72,with the ball extending, approximately hillfr-VVEJ through.

the collar and into a recess 7%- at the lower endofithc collar. A spring Misplaced in. the. hole; behind the ball 72 andmaintains the ball under resilient bias in the sc-, lectedrecess7tl by a set screw 76 closing the-other end of the hole remote from said ball. Thus, collar 60.may be rotated in step-by-step manner with the ball '72engaging successive recesses 78' to prevent accidental: displacementof the collar relative tothe plug 27 and to permit more. accurate adjustment of the needle end. 53. in the orifice 21.

The external surface of the flange portion 46 ofthe head 44 is provided with a series of indicia 63. spaced.

apart at equal angular intervals around the outer flange surface to. indicate the angular position of the head 38. relative to the plug 27 and amarker 59 is provided on the plug, cooperating with the indicia 68. Each subdivisional mark of the indicia 68. corresponds with one-of the recesses 79. so that the spring pressed ball. 72;. Will. be. engagedin a recess 7.0 corresponding to. the siubdivisional: mark ofthe indicia 68 in. register with the marker 69.

With the abovedescribed arrangement, the nozzle. is adjustedand calibrated to a predetermined capacity, for

example, a minimumcapacity, andthe collar 6.01s then.

The stem: 54?: is also provided.

rotated around the boss 63 until the stop pin 62 on the collar. contactsv the stop pin, 6.4. on. the. head. 44, and. the. collar is then locked in position by the set screw 61. This operation presets the adjustable nozzle at a definite, predetermined capacity. The capacity of the nozzle can then be adjustably varied by rotating the rotatable element 38 in a direction to move the stop pin 64 away from the stop pin 62, the increment changes in capacity being indicated by the indicia 68 as these indicia are moved past the pointer 6).

The invention may be. embodied in other. specific forms without departing from the spirit or essential characteristics thereof; Thepresent: embodiment is; therefore, to be considered in. all. respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are, therefore, intended to be embracedtherein.

What is claimed is:

1. In an adjustable liquid fuel nozzle having a tubular: barrel, an orifice plate disposed at one endof'said barrel and having an outwardly tapered orifice opening thcrcthrough in communication with the interior of said barrel, a needlevalve shank disposed coaxially of said barrel andhaving a-pointeo endtprojecting intosaidorifice open ing, and. means restraining said: shank against rotational movements relative to. said barrel while providing limited. freedom of longitudinal movement of the shank relative to the barrel; means arranged at the other end of. said: barrel for adjustably positioning: said shanltlongitudinally of! said. barrel comprising means providing at one. end of. saidbarrel: abore coaxial of said barrel, a rotatable element having a portion disposedin said. bore, means: connected: between. saidrotatable element and said barrel restraining; said rotatable element against movement longitudinally of said; barrel while. providing freedom of rotational movement of said rotatable element relative to said barrel, means. connected between saidrotatable element and said shank effectivev to move said shank longitudinally ofcsaidl barrel upon rotational. movement of said rotatable element relative to said barrel, stop means mounted on said barrel adjacent saidmtatableelementfor rotational. movements otadjustrnenu about the rotational axis of said rotatable element, and abutment means on saidrotatable elementengaging'said step means andxlimiting the rotational movement of said rotatable element relative. to said: barrel to an extent not exceeding one rotation.

2. In anadjus-tablc liquid fuel nozzlchaving a tubular barrel, anv orifice plate disposed atone. end of said barrel and. having an outwardly tapered. orifice opening therethrough in communication w-iththe interior of :saidbarrel, a needle. valve shank; disposed coaxial of said? barrel and. having a: pointed end projecting into said orifice opening, and means restraining saidshank against. rota.-

tional movements'relative to said barrel while providing a limited freedom of longitudinal mov'ementof theshank.

relative to the barrel; means arranged at. the other end or" said barrel for adjustably positioning said shank: longitudinally of said barrel comprising means providing at one end of said barrel av bore. coaxial of; said: barrel, a rotatable element having. aportion disposedin' saidborc, means connected between said, rotatable element and said barrel restraining said rotatable element against movement longitudinally of Said barrel while pro-vidingfree dom of rotational movement of said rotatable element relative to said barrel, means connected between said rotatable element and said shank effective to move said shank longitudinally of said barrel upon'rotational'movement' of said rotatable element relative to said barrel, stop meansmounted on saidbarrel adjacentsaid-rotatable elemeut for. rotational movementsofi adjustment about the rotational axisof said rotatable'element, abutment means on. said: rotatable. element engaging said step means and limiting the rotational movement of said rotatable element relative to said barrel to an extent not exceeding one rotation, and means releasabiy locking said stop means at selected positions of rotational adjustment relative to said barrel to preset a limiting position of said shank longitudinally of said barrel.

3. In an adjustable liquid fuel nozzle having a tubular barrel, an orifice plate disposed at one end of said barrel and having an outwardly tapered orifice opening therethrough in communication with the interior of said barrel, a needle valve shank disposed coaxial of said barrel and having a pointed end projecting into said orifice opening, and means restraining said shank against rotational movements relative to said barrel while providing a limited freedom of longitudinal movement of the shank relative to the barrel; means arranged at the other end of said barrel for adjustably positioning said shank longitudinally of said barrel comprising means providing at one end of said barrel a bore coaxial of said barrel, a rotatable element having a portion disposed in said bore, means connected between said rotatable element and said barrel restraining said rotatable element against movement longitudinally of said barrel while providing freedom of rotational movement of said rotatable element relative to said barrel, means connected between said rotatable element and said shank efiective to move said shank longitudinally of said barrel upon rotational movement of said rotatable element relative to said barrel, stop means mounted on said barrel adjacent said rotatable element for rotational movements of adjustment about the rotational axis of said rotatable element, abutment means on said rotatable element engaging said stop means and limiting the rotational movement of said rotatable element relative to said barrel to an extent not exceeding one rotation, and means releasably locking said stop means at selected positions of rotational adjustment relative to said barrel to preset a limiting position of said shank longitudinally of said barrel, and indicating means carried by said barrel and said rotatable element indicating increments of movement of said shank relative to said barrel away from said limiting position incident to rotation of said rotatable element relative to said barrel.

References Cited in the file of this patent UNITED STATES PATENTS 974,185 Quickel Nov. 1, 1910 1,297,229 Ostrander Mar. 11, 1919 1,506,943 Reed Sept. 2, 1924 2,308,944 Turco Jan. 19, 1943 2,319,574 Adney May 18, 1943 2,583,659 Martin Jan. 29, 1952 

